str1='111'
print(str1)
str2= "222"
str3 = """111
222
333"""
print('{0}---{1}---{2}'.format(1,2,3))
str4 = '666'
print(f'这个程序是{str4}')

sep = ','
print(sep.join(str4))

str5="good good study"
print("good".center(30,'*'))

for i in str5:
    print(i,end=" ")